public async Task Invoke_ShouldCallMiddleware()
{
var middleware = Substitute.For <IMiddlewareSubstitute>();
middleware
.Handle(Arg.Any <Context>(), Arg.Any <RouteFuncAsync>())
.ReturnsForAnyArgs(info =>
((RouteFuncAsync)info[1]).Invoke((Context)info[0])
);
_sut.Use(middleware.Handle);
await _sut.GetRuntime(_handlerFunc.Handle).Invoke(null);
await middleware.Received().Handle(Arg.Any <Context>(), Arg.Any <RouteFuncAsync>());
}